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Add chibicc

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This program popped up on Hacker News recently. It's the only modern
compiler I've ever seen that doesn't have dependencies and is easily
modified. So I added all of the missing GNU extensions I like to use
which means it might be possible soon to build on non-Linux and have
third party not vendor gcc binaries.
This commit is contained in:
Justine Tunney 2020-12-05 12:20:41 -08:00
parent e44a0cf6f8
commit 8da931a7f6
298 changed files with 19493 additions and 11950 deletions
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29
libc/str/strstr.c
View file

@ -18,7 +18,6 @@
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/alg.h"
#include "libc/dce.h"
#include "libc/nexgen32e/x86feature.h"
#include "libc/str/internal.h"
#include "libc/str/str.h"
@ -32,22 +31,26 @@
* @asyncsignalsafe
* @see memmem()
*/
char *(strstr)(const char *haystack, const char *needle) {
char *strstr(const char *haystack, const char *needle) {
size_t i;
if (needle[0]) {
if (needle[1]) {
if (!((intptr_t)needle & 0xf) && X86_HAVE(SSE4_2)) {
return strstr$sse42(haystack, needle);
} else {
size_t needlelen;
alignas(16) char needle2[64];
needlelen = strlen(needle);
if (needlelen < 64 && X86_HAVE(SSE4_2)) {
memcpy(needle2, needle, (needlelen + 1) * sizeof(char));
return strstr$sse42(haystack, needle2);
} else {
return tinystrstr(haystack, needle);
for (;;) {
#if 0 /* todo: fix me */
if (!((uintptr_t)haystack & 15) && X86_HAVE(SSE4_2) &&
(((uintptr_t)needle + strlen(needle)) & 0xfff) <= 0xff0) {
return strstr$sse42(haystack, needle);
}
#endif
for (i = 0;;) {
if (!needle[i]) return haystack;
if (!haystack[i]) break;
if (needle[i] != haystack[i]) break;
++i;
}
if (!*haystack++) break;
}
return NULL;
} else {
return strchr(haystack, needle[0]);
}